UTF8 Keymaping

[Bryn Salisbury]

Hello,

Having started to use Ubuntu with the cy_GB localisation, I tried to map 
the characters â, ê, î, ô, û, ŵ and ŷ to a simpler keypress.

Having mapped the right "windows" key to being a meta key, I've now 
managed to reduce it to 4 keypresses (meta+$letter, shift+6) but what 
I'd like to be able to do is to have it so that "meta+o" prints out an 
"ô" (and so on). 

I'm now however stuck as how best to proceed, can anyone help me with this?

Bryn